DE102023127802A1 - Cell module with rechargeable cells - Google Patents

Abstract

The invention relates to a cell module (1) with a plurality of rechargeable cells (2) for storing electrical current, each cell (2) having a positive pole (5) and a negative pole (6), and with a connecting structure which has at least a first connecting element (7) for electrically conductively connecting a plurality of positive poles (5) and at least a second connecting element (8) for electrically conductively connecting a plurality of negative poles (6). The first connecting element (7) and the second connecting element (8) are arranged on the same side of the cells (2) connected thereto.

Description

The invention relates to a cell module with a plurality of rechargeable cells for storing electrical current, each cell having a positive pole and a negative pole, and with a connecting structure which has at least one first connecting element for electrically conductively connecting a plurality of positive poles and at least one second connecting element for electrically conductively connecting a plurality of negative poles.

The invention further relates to a cell pack comprising at least two cell modules.

In addition, the invention relates to a method for producing a cell module with a plurality of rechargeable cells for storing electrical current, wherein each cell has a positive pole and a negative pole, and with a connecting structure which has at least a first connecting element and a second connecting element, wherein a plurality of positive poles are electrically conductively connected to one another with the first connecting element, and a plurality of negative poles are electrically conductively connected to one another with the second connecting element.

Rechargeable batteries, so-called secondary cells or accumulators, have recently become the focus of attention, not least for environmental reasons. Such batteries are known from the state of the art. For example, the AT 512 756 A1 a battery pack for supplying electrical energy with several round cells arranged in rows offset from one another, the round cells having electrical poles, and with a cover and base plate that protrudes at least partially over the poles of the round cells, are connected to the round cells for mechanical cohesion and have openings for air cooling of the round cells. The electrically conductive cover and base plates are connected to the poles of the round cells both electrically and materially.

The AT 521 526 A1 describes a battery comprising a plurality of battery modules and at least one structural component, wherein a plurality of battery modules are arranged in a row on a flat side of a common structural component, wherein the battery modules each have a lower busbar and an upper busbar, between which there are a plurality of battery cells with a uniform alignment of their poles, wherein one type of poles is connected to the lower busbar and the other type of poles is connected to the upper busbar, wherein each battery module has an upper cell holder which is above the battery cells and at least one lower cell pack holder which is below the lower busbars, wherein the following also applies to said row: that their battery modules are each aligned with their lower busbar towards the common structural component, that all battery cells contained in the row are facing the structural component with only one type of poles, that the battery modules of the row are connected in series, in that two consecutive battery modules each have an electrical connection between a lower busbar of a first of these battery modules and an upper busbar of the second of these battery modules.

The object of the invention is to simplify the cell contacting in such batteries.

The object of the invention is achieved in the cell module mentioned at the outset in that the first connecting element and the second connecting element are arranged on the same side of the cells connected thereto.

Furthermore, the object of the invention is achieved with the cell pack mentioned at the outset, in which the two cell modules are designed according to the invention.

In addition, the object of the invention is achieved with the method mentioned at the outset, according to which the first connecting element and the second connecting element are arranged on the same side of the cells connected thereto.

The advantage here is that the arrangement of the cell connectors on just one side of the cells allows the cell module to be made more compact. It also simplifies the production of the cell module, as all cell connectors can be prepared in a first step and can then be connected to the cells more easily, as further manipulation, such as turning the cell module, can be avoided.

To further simplify the components for the production of the cell module and the structure of the cell module, according to an embodiment variant of the invention it can be provided that the first and the second connecting element are or will be formed integrally with one another.

In order to improve the short-circuit safety during the production of the cell module, according to another embodiment of the invention, it can be provided that the positive poles of the cells in a first plane are electrically conductively connected to the first connecting element and the negative poles are electrically connected to the second connecting element in a different second level.

A further improvement in short-circuit safety can be achieved with a further embodiment of the invention, according to which the first connecting element has contact sections in which the positive poles are electrically conductively connected to the first connecting element, and intermediate sections which connect the contact sections to one another, wherein the intermediate sections are arranged in a different plane than the contact sections.

According to another embodiment of the invention, it can be provided that the first and the second connecting element are or will be arranged on a frame element. This makes it possible to simplify the arrangement of the connecting elements on the cells.

According to one embodiment variant, the frame element can have support surfaces for the first and the second connecting element, whereby an improved positioning of the connecting elements can be achieved.

According to one embodiment variant, it is advantageous if the frame element is part of a cell holder in which the cells are or will be at least partially arranged, so that the frame element can remain on the cell module and is therefore also available for positioning the connecting elements during operation. This can, for example, prevent changes in shape due to thermal stress on the cell module.

According to a further embodiment of the invention, for better mechanical protection of the cells, it can be provided that, when viewed from above onto the positive and negative poles, the cells are covered by at least 95% of their front surfaces by the frame element and the first and second connecting elements. No further components are therefore required for this, which can simplify the structural design of the cell module.

According to one embodiment of the cell pack, it can be provided that the first and second connecting elements of the first cell module and the first and second connecting elements of the second cell mode are arranged between the cells of the first and the second cell module, whereby the contacting of the cells of adjacent cell modules can be structurally simplified.

According to one embodiment of the invention, a tempering element can be arranged between the cells of the first and second cell modules. In this way, it is possible to achieve four pole arrangements with just one tempering element.

In order to achieve the above-mentioned advantages, according to an embodiment variant of the method, it can be provided that the frame element is formed as part of a cell holder, and that the cell holder equipped with the connecting elements is pushed onto the cells, and that the first connecting element is then electrically connected to the positive poles and the second connecting element is electrically connected to the negative poles of several rechargeable cells.

For a better understanding of the invention, it is explained in more detail with reference to the following figures.

• 1 ein Zellenmodul in Draufsicht;
• 2 das Zellenmodul nach 1 in Seitenansicht;
• 3 eine Zelle des Zellenmoduls in Schrägansicht;
• 4 Verbindungselemente zum elektrischen Verbinden von Zellen des Zellenmoduls;
• 5 einen Ausschnitt aus einem Zellenmodul in Schrägansicht von oben;
• 6 einen Ausschnitt aus einem Zellenmodul in Seitenansicht;
• 7 einen Zellenhalter in Schrägansicht;
• 8 den Zellenhalter nach 7 mit aufgelegten Verbindungselementen in Schrägansicht;
• 9 einen Ausschnitt aus einem Zellenmodul in Draufsicht ohne Verbindungselemente;
• 10 den Ausschnitt aus dem Zellenmodul nach 9 in Draufsicht mit Verbindungselementen;
• 11 eine Ausführungsvariante eines Zellenpacks in Seitenansicht;
• 12 einen Ausschnitt aus einer anderen Ausführungsvariante eines Zellenpacks in Seitenansicht.

They show in a simplified, schematic representation:

• 1 a cell module in top view;
• 2 the cell module after 1 in side view;
• 3 a cell of the cell module in oblique view;
• 4 Connecting elements for electrically connecting cells of the cell module;
• 5 a section of a cell module in an oblique view from above;
• 6 a section of a cell module in side view;
• 7 a cell holder in oblique view;
• 8th the cell holder 7 with attached connecting elements in oblique view;
• 9 a section of a cell module in plan view without connecting elements;
• 10 the section from the cell module to 9 top view with connecting elements;
• 11 a variant of a cell pack in side view;
• 12 a section of another design variant of a cell pack in side view.

By way of introduction, it should be noted that in the various embodiments described, identical parts are provided with identical reference symbols or identical component designations, whereby the disclosures contained in the entire description can be transferred analogously to the same parts with the same reference symbols or the same component designations. The position information chosen in the description, such as top, bottom, side, etc., also refers to the figure directly described and shown, and these position information must be transferred analogously to the new position if the position changes.

In the 1 and 2 a cell module 1 is shown in various views. The cell module 1 comprises several cells 2. The cells 2 serve for the repeatable storage of electrical energy. The cells 2 can also be referred to as secondary cells or accumulator cells. For example, the cells 2 are so-called lithium-ion accumulator cells, in particular with lithium nickel manganese cobalt oxide chemistry (NMC) or lithium nickel cobalt aluminum oxide chemistry (NCA) or with lithium iron phosphate chemistry (LFP). The cells 2 are preferably designed as round cells (cylindrical cells). However, they can also have a different shape, for example a prismatic one.

It should be noted that the 1 and 2 The geometric design of the cell module 1 shown and the concrete number of cells 2 shown are not to be seen as limiting the invention or the cell module 1. The cells 2 are arranged in rows 3 and columns 4, with rows 3 which follow one another directly being offset from one another so that the cells 2 in one row 3 can be partially arranged in gaps between the cells 2 in the adjacent rows 3. The rows 2 may also not be offset. Furthermore, there are preferably several rows 3 and several columns 4 per cell module 1. The cell module 1 may also have just one row of 3 cells 2 or one column of 4 cells 2. Preferably, all rows 3 and/or all columns 4 have the same number of cells 2.

How better 3 As can be seen, each cell 2 has a positive pole 5 or generally the first pole (hereinafter referred to as positive pole 5) and a negative pole 6 or generally the second pole (hereinafter referred to as negative pole 6). The positive pole 5 and the negative pole 6 are arranged on the same side of the cells 2. In the embodiment of the cell 2 shown, the positive pole 5 is arranged centrally and protrudes from the cell 2. The negative pole 6 is ring-shaped and arranged radially further out than the positive pole 5.

Preferably, all cells 2 are arranged in the cell module 1 with the same orientation with respect to their poles.

After several cells 2 are arranged in the cell module 1, the cell module has a connection structure to simplify the contacting of the poles of the cells. This has at least one first connection element 7 for the electrically conductive connection of several positive poles 5 and at least one second connection element 8 for the electrically conductive connection of several negative poles 6, as is shown in a preferred embodiment in 4 is shown. In this embodiment, the two connecting elements are formed in one piece with each other, thus forming only one common connecting structure element. However, it is possible for the first and second connecting elements 7, 8 to be arranged separately from each other and for an electrical connection to be made separately.

With the one-piece design variant of the connecting elements 7, 8, the positive poles 5 are electrically connected to the negative poles 6 of two columns 4 of cells 2 arranged directly next to one another.

Generally, the first connecting element 7 and the second connecting element 8 are arranged on the same side of the cells 2 connected to them, i.e. on the side on which the poles of the cells 2 are also arranged.

Furthermore, the first connecting element 7 and/or the second connecting element 8 preferably have a sequence of repeating units in their longitudinal direction, as can be seen from 4 is evident.

It is further preferred if the first connecting element 7 and/or the second connecting element 8 extends continuously over the entire number of cells 2 of a column 4, so that with the exception of the edge columns 4, a first and a second connecting element 7, 8 are arranged per column 4 of cells 2.

For the two marginal columns 4, separate connecting elements 7, 8 are preferably provided, which exclusively have a first connecting element 7 for the positive poles 5 or exclusively a second connecting element 8 for the negative poles 6. In addition, these marginal connecting elements 7, 8 can also have connection sections 9 for a further cell module 1 or for the electrical integration of the cell module 1 into an electrical circuit.

The first connecting element 7 and the second connecting element 8 are made of an electrically conductive material, in particular of a metal or a metallic alloy or a plated material made of metals that are purely mechanically bonded to one another, such as aluminum, copper, nickel or alloys made of or with these metals. The first connecting element 7 and the second connecting element 8 can be designed as a single layer or as a laminate, for example with intermediate layers or electrical insulating layers. The electrically conductive part of the first connecting element 7 and the second connecting element 8 can have, or the first and second connecting elements 7, 8 can have, a layer thickness of between 0.1 mm and 0.5 mm. Increasing the layer thickness above 0.5 mm is possible, but this can impair the material bond to the cells.

The first connecting element 7 and/or the second connecting element 8 can be made from a metal sheet or a metal plate, e.g. from a sheet metal strip. The preferred shape described in more detail below can be produced by forming or by cutting processes, such as punching. However, other designs and production processes are also possible.

In the preferred embodiment of the invention, all cells 2 of a column 4 are connected to the first connecting element 7 and to the second connecting element 8, as already explained above. The first connecting element 7 and/or the second connecting element 8 can also have other dimensions, so that more or fewer cells 2 are detected, although this is not preferred.

The first connecting element 7 can have a sequence of first contact sections 10 and intermediate sections 11. In the contact sections 10, the first connecting element 7 is electrically connected to the cells 2, ie the positive poles 5, as can be seen from the 5 and 6 which each show sections of a cell module 1. The connection can be made by means of a material bond, for example by laser welding, etc. The material bonding surfaces, ie the surface of the contact sections which is materially bonded to the positive pole 5) can be spiral-shaped, circular, point-shaped or ring-shaped (as in the 5 and 6 shown). The proportion of the respective material connection area to the corresponding area of the contact section can be between 5% and 40%, for example between 5% and 20%. Preferably, the material connection area of the positive pole 5 is larger than that of the negative pole 6 per cell 2, for example between 2 times and 5 times larger.

The contact sections 10 are preferably designed as cylinders with circular end faces. The end faces can have a size that is between 50% and 100%, for example between 80% and 100%, of the area of the associated positive pole 5 that rests on the respective contact section 10.

The intermediate sections 11 connect the contact sections 10 to one another. The intermediate sections 11 can each have a recess 12, which is designed in particular as openings through the intermediate sections 11. This can provide tolerance compensation during forming, since these recesses 12 can expand during forming. As a result, the semi-finished product remains dimensionally stable and can therefore be produced without expensive, complex forming tools, such as with pre-tensioned spring cushions, etc. These can begin on one end of the intermediate sections 11, so that these recesses 12 are open, i.e. not completely closed. Furthermore, the recesses 12 can have an expanding cross-section, whereby the omega-shaped cross-section of the recesses 12 shown in the figures is only to be understood as an example.

The intermediate sections 11 can be arranged in a plane with the contact sections 12, so that the intermediate sections 11 immediately, ie directly, connect to the contact sections. According to a preferred embodiment of the first connecting elements 7, however, it can be provided that the intermediate sections 11 are arranged in a different plane than the contact sections 10, in particular in a plane arranged further away in relation to the positive poles 5, as is shown, for example, in FIG. 5 is evident. In other words, in this embodiment, the contact sections 10 are arranged lower in the cell module 1 than the intermediate sections 11.

Preferably, all contact sections 10 of a first connecting element 7 or of a cell module 1 are arranged in a first common plane and all intermediate sections 11 of a first connecting element 7 or of a cell module 1 are arranged in a second common plane.

In order to achieve this arrangement in different planes, connecting sections 13 are arranged or formed between the contact sections 10 and the intermediate sections 11. The connecting sections 13 are arranged at an angle to the contact sections 10 and the intermediate sections 11 which is not equal to 0° and preferably greater than or equal to 90°. The connecting sections preferably run sections 13 obliquely upwards (viewed from the plane of the contact sections 10).

It is further preferred if only one connecting section 13 is formed between a contact section 10 and an adjoining intermediate section 11, so that the contact sections 10 (if necessary with the exception of the two in 4 shown edge contact sections 10 at the beginning and at the end of the first connecting element 7) are each connected to two connecting sections 13 with two intermediate sections 11. However, more than one connecting section 13 can also be arranged between each contact section 10 and an intermediate section 11, for example two or three.

Due to the arrangement of the connecting sections 13, the first connecting element 7 has a mountain-valley course.

It is further preferred if the contact sections 10 are arranged in such a way that the connecting sections do not lie in a line, but rather a zigzag pattern is formed (viewed in a top view of the first connecting element 7). Longitudinal center axes 14 through the connecting sections 13 thus preferably run at an angle to one another that is not equal to 180°. To protect individual cells, a web to the positive pole 5 can also be reduced to a width between 0.8 mm and 1.5 mm, for example to 1 mm.

The second connecting element 8 also has contact sections 15 and intermediate sections 16. In the contact sections 15, the second connecting element 8 is connected to the negative poles 6 of the cells 2, in particular in a materially bonded manner, preferably by laser welding. The intermediate sections 16 serve, among other things, to connect the contact sections 15 to one another to form the second connecting element 8.

Viewed from above, the second connecting element 8 can have at least approximately a serpentine shape. As can be seen in particular from 5 As can be seen, this ensures that the contact sections 15 of the second connecting element 8 are arranged further apart from the contact sections 10 of the first connecting element 7. A distance 17 between the contact sections 10 and the contact sections 15 of two first and second connecting elements 7, 8 arranged directly next to one another can be at least 1 mm to at least 5 mm, for example between 2 mm and 4 mm.

Due to the arrangement of the cells 2 in the cell module 1, the contact sections 10 and the contact sections 15 of two first and second connecting elements 7, 8 arranged directly next to one another can be arranged opposite one another. If the first and the second connecting elements 7, 8 are formed integrally with one another to form the above-mentioned connecting structure element, the contact sections 10 of the first connecting element 7 are opposite the intermediate sections 16 of the second connecting element 8 and the contact sections 15 of the second connecting element 8 are opposite the intermediate sections 11 of the first connecting element 7 in the connecting structure element. The connection of the first connecting element 7 with the second connecting element 8 to form the connecting structure element is preferably formed between the contact sections 15 of the second connecting element 8 and the intermediate sections 11 of the first connecting element 7, as can be seen, for example, from 5 is apparent. If the intermediate sections 11 of the first connecting element 7 are located on a higher level, as explained above, obliquely extending connecting sections 17 can also be formed between the first and second connecting elements 7, 8. With regard to these connecting sections 17, reference is made to the explanations regarding the connecting sections 13 of the first connecting element 7, which can also be applied to the connecting sections 17 between the first and second connecting elements 7, 8.

The second connecting element 8 can be flat or can have a mountain-valley shape as described above for the first connecting element 7. The contact sections 15 and the intermediate sections 16 can thus be arranged in one plane or in different planes. Reference is also made to the corresponding explanations for the planes of the first connecting element 7.

As from 4 As can be seen, the second connecting element can have terminal flags 18. The flags 18 can be used to parallelize the cell modules 1. After connection, minimal BMS equalizing currents flow through these flags 18 and ensure a homogeneous voltage curve within the cell modules 1. The (two) cell modules 1 can therefore be operated with just one BMS module. The BMS (battery management system) can also be wired to these flags 18 and the voltage tap can be carried out in this way.

According to a variant of the cell module 1, it can be provided that the positive poles 5 of the cells 2 are electrically conductively connected to the first connecting element 7 in a first plane and the Negative poles 6 are electrically connected to the second connecting element 8 in a different second plane. This design variant is also made of 5 In particular, it can be provided that the first level of the electrically conductive connection of the positive poles 5 in the cell module 1 is formed above the second level of the electrically conductive connection of the negative poles 6, so that the positive poles 5 protrude beyond the negative poles 6 in the direction of the connecting elements 7, 8.

For the production of the cell module 1, it has proven to be advantageous if the first and second connecting elements 7, 8 are placed on a frame element 19 so that they are arranged on the frame element 19 in the cell module 1. The frame element 19 can be designed as a simple frame. In the preferred and in the 7 and 8th In the embodiment of the cell module shown, the frame element 19 is part of a cell holder 20. For this purpose, the cell holder 20 has a cell receiving element 21 in which recesses 22 are arranged or formed for at least partially receiving the cells 2, as can be seen from 2 is evident. In the present embodiment, the recesses 22 in the cell receiving element 22 are designed as cylindrical openings. In general, however, the shape of the recesses 22 can be based on the respective shape of the cells 2. With the cell holder 20, the cells 2 in the cell module 1 are positioned in the correct position relative to one another or are kept at a distance from one another.

Preferably, the frame element 19 and the cell receiving element 21 are designed as a one-piece cell holder 20. For example, the cell holder 20 can be formed as an injection-molded part made of a plastic.

The frame element 19 can be formed by a simple, circumferentially closed frame on which the first and second connecting elements 7, 8 are supported only in the end regions. In the preferred embodiment, however, the frame element 19 (as part of the cell holder 20) additionally has support surfaces 23 on which the first and second connecting elements 7, 8 can also be supported in the region of the cells 2. These support surfaces 23 can be formed, for example, by shaped elements of the frame element 19, which are arranged or formed in the frame element 19 as an extension of the side walls 24 (directly) delimiting the recesses 22 in the cell receiving element 21. Since a separate recess 22 is preferably provided in the cell holder 20 for each cell 2, support surfaces 23 for the first and second connecting elements 7, 8 are preferably formed between each cell 2.

According to a variant of the design, the frame element 19 can have projections 24 projecting beyond the support surfaces 23. Reference should also be made to 5 The projections 24 can be arranged between the first and second connecting elements 7, 8 so as to protrude beyond them. They are preferably arranged on the support surfaces 23. With the projections 24, a better positioning of the first and second connecting elements 7, 8 on the frame element 19 can be achieved.

As is particularly evident from 5 As can be clearly seen, in a one-piece design of the first and second connecting elements 7, 8 to form the said connecting structure element, it can be provided that projections 24 penetrate the connecting structure element, for which purpose corresponding openings 25 can be formed in the connecting structure element between the first and second connecting elements 7, 8.

How to continue 5 As can be seen, the shape of the projections 24 can be at least partially adapted to the shape of the first and second connecting elements 7, 8.

With these design variants, a further improvement in the positioning or, if necessary, a positional fixation of the first and second connecting elements 7, 8 on the frame element 19 can be achieved.

For better holding or fixing of the cells 2, projections 26 projecting towards the cells 2 can be provided in the cell holder 20, which can engage or snap into recesses 27 in the cells 2, for example annular grooves in the cell casing, as shown in 5 is shown.

8th shows the frame element 19 fully equipped with the first and second connecting elements 7, 8 or the fully equipped cell holder 20. This fully equipped cell holder 20 can then be arranged on the prepared cells 2, which can be arranged in a mounting bracket, for example, and in particular can be slipped over the cells 2. The first and second connecting elements 7, 8 are then electrically connected to the positive poles 5 and negative poles 6 in an electrically conductive manner, for example by welding. For this purpose, the first and second connecting elements 7, 8 can be pressed against the cells if necessary.

The 9 and 10 show a comparison of a section of a cell module 1 in plan view with and without first and second connecting elements 7, 8. As can be clearly seen, the Cells 2, in particular their positive poles 5 and negative poles 6, are covered over a large area by the frame element 19 and the first and second connecting elements 7, 8. According to one embodiment of the cell module 1, it can be provided that in a plan view of the positive poles 5 and the negative poles 6, the cells 2 are covered by at least 95%, in particular at least 97%, of their end faces by the frame element 19 and the first and second connecting elements 7, 8.

In 11 a variant of a cell pack 28 is shown.

The cell pack 28 comprises or consists of two cell modules 1 according to the invention. In the illustrated embodiment of the cell pack 28, the two cell modules 1 are arranged such that the first and second connecting elements 7, 8 of the first cell module 1 and the first and second connecting elements 7, 8 of the second cell module 1 are arranged between the cells 2 of the first and second cell modules 1. In other words, the poles of the cells 2 of the first cell module 1 face the poles of the cells 2 of the second cell module 1.

However, it should be noted that the cell pack 28 can also have more than two cell modules 1 depending on the area of application. Furthermore, the cell modules can all be arranged in one level or in more than two levels.

In 12 a section of a further embodiment of the cell pack 28 is shown. In this embodiment of the cell pack 28, it is provided that a tempering element 29, in particular a liquid cooler, is arranged between the cells 2 of the first and the second cell module 1.

According to a further embodiment of the cell holder 1, it can be provided that individual cell protection in the form of overload protection is provided for the cells 2. This can be achieved by reducing the thickness of the first and/or second connecting elements 7, 8 at least in the area of the connection to the positive poles 5 or negative poles 6. In this case, the thickness in these reduced areas can be between 0.5 mm and 2 mm.

The embodiments show possible design variants of the cell module 1 or the cell pack 28, whereby it should be noted at this point that combinations of the individual design variants are also possible.

• - Für die Pluspole 5 eine Abfolge von Kontaktabschnitten 10 und Zwischenabschnitten 11 und/oder
• - Für die Minuspole 6 eine Abfolge von Kontaktabschnitten 15 und Zwischenabschnitten 16.

Furthermore, a busbar in the form of one of the embodiments of the first and/or second connecting element or the connecting structure element described above and/or shown in the figures can represent an independent invention in itself. Such a busbar has at least:

• - For the positive poles 5, a sequence of contact sections 10 and intermediate sections 11 and/or
• - For the negative poles 6, a sequence of contact sections 15 and intermediate sections 16.

Preferably, the contact sections 10 are arranged in a plane that is different from a plane of the intermediate sections 11 (peak-valley arrangement). It may be that the contact sections 15 are arranged in a plane that is different from a plane of the intermediate sections 16 (peak-valley arrangement). Alternatively or additionally, it may be provided that the contact sections 10 are arranged in a plane that is different from a plane of the contact sections 15 (peak-valley arrangement).

The frame element 19 or the cell holder 20 can also represent an independent invention. At least the frame element 19 or the cell holder 20 has the described support surfaces 23 for the first and second connecting elements 7, 8 and preferably also the described projections 24.

Finally, for the sake of clarity, it should be noted that for a better understanding of the structure, the cell module 1 or the cell pack 28 or elements thereof are not necessarily shown to scale.

List of reference symbols

1

Cell module

2

cell

3

Row

4

Split

5

Positive pole

6

Negative pole

7

Connecting element

8th

Connecting element

9

Connection section

10

Contact section

11

Intermediate section

12

Recess

13

Connecting section

14

Longitudinal center axis

15

Contact section

16

Intermediate section

17

Connecting section

18

banner

19

Frame element

20

Cell holder

21

Cell receiving element

22

Recess

23

Support surface

24

head Start

25

breakthrough

26

head Start

27

Recess

28

Cell pack

29

Tempering element

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• AT 512756 A1 [0004]
• AT 521526 A1 [0005]

Claims (15)

Cell module (1) with a plurality of rechargeable cells (2) for storing electrical current, each cell (2) having a positive pole (5) and a negative pole (6), and with a connecting structure which has at least a first connecting element (7) for electrically conductively connecting a plurality of positive poles (5) and at least a second connecting element (8) for electrically conductively connecting a plurality of negative poles (6), characterized in that the first connecting element (7) and the second connecting element (8) are arranged on the same side of the cells (2) connected thereto. Cell module (1) according to Claim 1 , characterized in that the first and the second connecting element (7, 8) are formed integrally with one another. Cell module (1) according to Claim 1 or 2 , characterized in that the positive poles (5) of the cells (7) are electrically conductively connected to the first connecting element (7) in a first plane and the negative poles (6) are electrically conductively connected to the second connecting element (7) in a different second plane. Cell module (1) according to one of the Claims 1 until 3 , characterized in that the first connecting element (7) has contact sections (10) in which the positive poles (5) are electrically conductively connected to the first connecting element (7), and intermediate sections (11) which connect the contact sections (10) to one another, wherein the intermediate sections (11) are arranged in a different plane than the contact sections (10). Cell module (1) according to one of the Claims 1 until 4 , characterized in that the first and the second connecting element (7, 8) are arranged on a frame element (19). Cell module (1) according to Claim 5 , characterized in that the frame element (19) has support surfaces (23) for the first and the second connecting element (7, 8). Cell module (1) according to Claim 5 or 6 , characterized in that the frame element (19) is part of a cell holder (20) in which the cells (2) are at least partially arranged. Cell module (1) according to one of the Claims 5 until 7 , characterized in that in plan view of the positive poles (5) and the negative poles (6), the cells (2) are covered by at least 95% of their end faces by the frame element (19) and the first and second connecting elements (7, 8). Cell pack (28) comprising at least two cell modules (1), characterized in that the cell modules (1) are designed according to one of the Claims 1 until 8th are trained. Cell pack (28) to Claim 9 , characterized in that the first and second connecting elements (7, 8) of the first cell module (1) and the first and second connecting elements (7, 8) of the second cell module (1) are arranged between the cells (2) of the first and second cell modules (1). Cell pack (28) to Claim 10 , characterized in that a tempering element (29), in particular a liquid cooler, is arranged between the cells (2) of the first and the second cell module (1). Method for producing a cell module (1) with a plurality of rechargeable cells (2) for storing electrical current, each cell (2) having a positive pole (5) and a negative pole (6), and with a connecting structure which has at least a first connecting element (7) and a second connecting element (8), a plurality of positive poles (5) being electrically conductively connected to one another with the first connecting element (7), and a plurality of negative poles (6) being electrically conductively connected to one another with the second connecting element (8), characterized in that the first connecting element (7) and the second connecting element (8) are arranged on the same side of the cells (2) connected thereto. Procedure according to Claim 12 , characterized in that the first and the second connecting element (7, 8) are formed in one piece. Procedure according to Claim 12 or 13 , characterized in that the first and the second connecting element (7, 8) are arranged on a frame element (19). Procedure according to Claim 14 , characterized in that the frame element (19) is designed as part of a cell holder (20), and that the cell holder (20) equipped with the connecting elements (7, 8) is pushed onto the cells (2), and that thereafter the first connecting element (7) is electrically connected to the positive poles (5) and the second connecting element (8) is electrically connected to the negative poles (6) of a plurality of rechargeable cells (2).

Images